Changes to Regulation (EEC) No 1561/70 of the Commission of 31 July 1970 laying down conditions for awarding contracts…
EU Regulation No 1561/1970
Made by Regulation (EEC) No 1371/89 amending Regulations (EEC) No 1561/70, (EEC) No 1562/70 and (EEC) No 55/72…
From legislation.gov.uk's record of changes, the official one: see it there.